CN201413987Y - Protection circuit for inverter controller - Google Patents
Protection circuit for inverter controller Download PDFInfo
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- CN201413987Y CN201413987Y CN2009200269192U CN200920026919U CN201413987Y CN 201413987 Y CN201413987 Y CN 201413987Y CN 2009200269192 U CN2009200269192 U CN 2009200269192U CN 200920026919 U CN200920026919 U CN 200920026919U CN 201413987 Y CN201413987 Y CN 201413987Y
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Abstract
The utility model discloses a protection circuit for an inverter controller, comprising a DC power supply which is generated when a system is electrified and is disappeared when in power failure; theDC power supply is respectively connected with a base electrode of a first PNP type triode and the anode of a diode; the cathode of the diode is connected with the emitting electrode of the first PNPtype triode on the one hand, and is connected with an energy storage capacitor on the other hand; and a collector electrode of the first PNP type triode is directly connected with an enable pin of theinverter controller or connected therewith by a reverse circuit. The protection circuit can be controlled by the time sequence of power on and off the inverter controller, and the inverter controllerstrops outputting driving signals in the process of power on and off, so that a main power device connected at the driving signal output end of the inverter controller can work in a very safe workingarea, and effective protection for a post-stage circuit can be realized. The protection circuit can be applied to an inverter circuit used for providing working power supply for a backlight lightingtube in the design of a liquid crystal display (LCD) screen, and can effectively solve the problem of power-off screen flash.
Description
Technical field
The utility model belongs to the inverter circuit technical field, specifically, relates to a kind of control circuit that electric protection and power down protection are provided for the inverter controller in the inverter circuit.
Background technology
Inverter in the LCD TV is a kind of equipment of power conversion.By the image-forming principle of LCD TV as can be known, crystal itself is not luminous, and the grating on the LCD screen is formed by the light penetration crystal that the inner backlight lamp tube of liquid crystal display screen sends, and the operating voltage of liquid crystal screen backlight lamp pipe is then provided by inverter independently.
Inverter, promptly Inverter is one the parts of direct current (DC) voltage transformation for interchange (AC) voltage also is called the boost in voltage plate, the backlight lamp tube that aims at liquid crystal display screen provides working power.Present inverter adopts pulse-width modulation (PWM) technology mostly, and its core is an inverter controller that pwm signal can be provided.Utilize the pwm signal of described inverter controller output to control the metal-oxide-semiconductor break-make that is connected with the elementary winding of contravariant transformer, and then by the desired power supply of backlight lamp tube in the secondary winding output back level liquid crystal display screen of contravariant transformer.
Present inverter controller, the required dc power supply VDD of its work generally all are direct direct voltages from AC/DC or the output of DC/DC converter, through switch control.In this case, electrifying timing sequence generally all can be controlled, such as having access to electricity slightly early than the road DC power supply VCC of power supply VDD input power supply as the DC/DC converter, by the required power supply VDD of DC/DC converter output, the electrifying timing sequence that so just can guarantee power supply VDD is later than DC power supply VCC, and then satisfies the electrifying timing sequence requirement of system to each road power supply.But power-off sequential generally all is uncontrollable.Can there be a minefield like this, might be when the inverter controller power down, for the inverter controller that is provided with two or more drive signal outputs, the phenomenon that two complementary drive signal output can occur leading directly to, thereby cause its follow-up main power device to lose efficacy easily, the situation that the shutdown screen dodges occurs.
The utility model content
The utility model is in order to solve existing inverter controller because of lacking the power down protection circuit causes follow-up main power device inefficacy easily in system's power down moment problem; a kind of novel inverter controller protective circuit is provided; connect the power down protection circuit by Enable Pin at inverter controller; Enable Pin at the mid-inverter controller of process of system's power down is a disarmed state; thereby can block the output of inverter controller, realize protection late-class circuit or equipment.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of protective circuit that is used for inverter controller; comprise the DC power supply that a system disappears when powering on back generation, power down; described DC power supply is connected with the base stage of the first positive-negative-positive triode and the anode of a diode respectively; the negative electrode of described diode connects the emitter of the first positive-negative-positive triode on the one hand; connect a storage capacitor on the other hand; the level definition that the collector electrode of the described first positive-negative-positive triode is followed according to the Enable Pin of inverter controller, selection directly connects or connects by negater circuit the Enable Pin of inverter controller.
Wherein, the collector electrode of the described first positive-negative-positive triode perhaps connects the input of negater circuit by the Enable Pin of filter circuit connection inverter controller by filter circuit.
Further, include a NPN type triode in described negater circuit, the base stage of a described NPN type triode connects the collector electrode of the first positive-negative-positive triode, and the collector electrode of a NPN type triode connects the Enable Pin of inverter controller, grounded emitter.
In order to make the electric charge that is kept in storage capacitor bleed off smoothly after system's power down, with the positive pole of described storage capacitor by the bleed off grounding through resistance.
In order further inverter controller and subsequent conditioning circuit thereof to be realized protection; on the Enable Pin of described inverter controller, also be connected with the protective circuit that powers on; comprise the RC charging circuit and first switching circuit; described RC charging circuit is connected between the control end of the described DC power supply and first switching circuit, and the switch ways of described first switching circuit is connected between the Enable Pin and ground of inverter controller.In the charging process of RC charging circuit, by controlling the break-make of first switching circuit, the Enable Pin of putting inverter controller is a disarmed state, and then the output of blocking-up inverter controller, avoids its drive signal output straight-through phenomenon to occur.
Further again, the control end of described first switching circuit is connected the connected node place of electric capacity and resistance in the RC charging circuit, perhaps connects electric capacity by the resistance in the RC charging circuit, and then connects described DC power supply by described electric capacity.
Preferably, described first switching circuit preferably adopts a NPN type triode to set up and forms, and the base stage of described the 2nd NPN type triode connects the RC charging circuit, and by a grounding through resistance, its collector electrode connects the Enable Pin of inverter controller, grounded emitter.
Further again, the control circuit that in the described protective circuit that powers on, also includes a control inverter controller electrifying timing sequence, in described sequential control circuit, include the second positive-negative-positive triode, described DC power supply connects the emitter of the second positive-negative-positive triode on the one hand, the switch ways that connects the second switch circuit on the other hand by first potential-divider network, and the switch ways ground connection of passing through described second switch circuit, the dividing potential drop node of described first potential-divider network connects the base stage of the described second positive-negative-positive triode, and the collector electrode of the second positive-negative-positive triode connects the power end of inverter controller; Described DC power supply connects second potential-divider network, and the dividing potential drop node of described second potential-divider network is connected with the control end of described second switch circuit and the Enable Pin of inverter controller respectively.
Further, the dividing potential drop node of described second potential-divider network connects the anode of switching diode, and connects the Enable Pin of inverter controller by the negative electrode of described switching diode.
Preferably, described second switch circuit preferably adopts a NPN type triode to realize that the base stage of described the 3rd NPN type triode connects the dividing potential drop node of second potential-divider network, grounded emitter, and collector electrode connects described DC power supply by first potential-divider network.
Compared with prior art; advantage of the present utility model and good effect are: protective circuit of the present utility model is controlled by power-off sequential and electrifying timing sequence to inverter controller; make inverter controller power on and the process of power down in stop output drive signal; thereby make the main power device that is connected its drive signal output be operated in a service area as safe as a house, to realize effective protection to late-class circuit.Described protective circuit is applied in the liquid crystal TV set, and backlight lamp tube provides the inverter circuit of working power in the liquid crystal display screen to be designed to, thereby can effectively solve the problem that the shutdown screen dodges.
After reading the detailed description of the utility model execution mode in conjunction with the accompanying drawings, other characteristics of the present utility model and advantage will become clearer.
Description of drawings
Fig. 1 is the circuit theory diagrams of a kind of embodiment of the peripheral circuit of the inverter controller that proposes of the utility model;
Fig. 2 is the circuit theory diagrams of a kind of embodiment that are used for the protective circuit of inverter controller shown in Figure 1.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is done explanation in further detail.
The utility model for fear of inverter controller at system's power down or powered on moment; make the complementary drive signal output part of inverter controller straight-through phenomenon occur easily owing to lack power down or electrifying timing sequence control circuit; thereby the problem that causes follow-up main power device to lose efficacy; a kind of protective circuit that is applicable to inverter controller has been proposed; by on the Enable Pin of inverter controller, connecting the power down protection circuit and the protective circuit that powers on; thereby to inverter controller power on and power-off sequential control; make inverter controller system power on and the process of power down in stop the output of drive signal, to reach the purpose of design of protection late-class circuit.
Be example below with the liquid crystal TV set, elaborate the concrete composition structure and the operation principle thereof of described protective circuit by a specific embodiment.
Embodiment one, and referring to shown in Figure 1, in the present embodiment, described inverter controller can specifically adopt one to be exclusively used in the integrated chip N701 realization that CCFL (cathode fluorescent tube) drives.Described inverter controller N701 comprises two-way drive signal output DRV1, DRV2, and the two-way PWM drive signal of output is complementary symmetry.The PWM drive signal of two-way drive signal output DRV1, the DRV2 output by inverter controller N701 acts on the main power device of back level, such as field effect transistor, the break-make sequential of control field effect transistor, and then DC bus-bar voltage is converted to alternating voltage exports the elementary of contravariant transformer to, and then generate the required working power voltage of liquid crystal display screen backlight lamp tube by the secondary conversion of contravariant transformer, be the backlight lamp tube power supply.
Described inverter controller N701 is provided with Enable Pin ENA, and inverter controller N701 is when only the voltage on its Enable Pin ENA satisfies certain requirement, and such as greater than certain threshold voltage the time, its drive signal output DRV1, DRV2 just have output.Utilize this characteristic of inverter controller N701; on the Enable Pin of inverter controller N701, design power on protective circuit and power down protection circuit; make inverter controller N701 system power on and the process of power down in can control action can not satisfy above-mentioned requirements to the voltage of Enable Pin ENA; such as not reaching the required threshold voltage of Enable Pin ENA; thereby the output of blocking-up inverter controller N701 realizes the protection to late-class circuit.
Below with Enable Pin ENA when the threshold voltage that receives greater than 2V, be communicated with inverter controller N701 and be output as example, elaborate the concrete composition structure and the operation principle thereof of described power on protective circuit and power down protection circuit.
Fig. 2 is the circuit theory diagrams of a kind of embodiment of described power on protective circuit and power down protection circuit.Wherein ,+5V DC power supply 5VM is by the power panel output of liquid crystal TV set inside, and at first foundation after system's interchange powers on, and its electrifying timing sequence is early than the required power supply VDD of inverter controller N701.Utilize this road DC power supply 5VM to design power on protective circuit and power down protection circuit, and then the output of control inverter controller N701, to realize effective protection to the late-class circuit that is connected its drive signal output DRV1, DRV2.
In the protective circuit that powers on, include the RC charging circuit and first switching circuit.Wherein, the RC charging circuit is set up by capacitor C 777 and resistance R 777 and is formed; First switching circuit preferably adopts a NPN type triode V777 (i.e. the 2nd NPN type triode) to realize.One end of capacitor C 777 connects DC power supply 5VM, and the other end can directly connect the base stage of NPN type triode V777, and by resistance R 777 ground connection; The base stage that perhaps can connect NPN type triode V777 as shown in Figure 2 by resistance R 777, and then by resistance R 778 ground connection.The grounded emitter of described NPN type triode V777, collector electrode connects the Enable Pin ENA of inverter controller N701.
In system's power up, DC power supply 5VM at first sets up generation, carries out the RC charging by capacitor C 777 and resistance R 777, R778, and the time constant of charging can specifically be determined by the parameter value that disposes capacitor C 777 and resistance R 777, R778.In the process that DC power supply 5VM charges to capacitor C 777; the base voltage that acts on NPN type triode V777 reduces gradually; do not falling to 0.7V when following; NPN type triode V777 is in conducting state always; and then the Enable Pin ENA voltage of inverter controller N701 is pulled low to 0V; make the voltage that acts on Enable Pin ENA be lower than threshold voltage; thereby close the internal circuit of inverter controller N701; make its drive signal output DRV1; the output of DRV2 no signal; and then control connection quits work in thereafter field effect transistor; to prevent drive signal output DRV1; DRV2 is straight-through at powered on moment; cause field effect transistor to lose efficacy; cause damage, and then reached the purpose of design of last electric protection late-class circuit or liquid crystal display screen.When the base voltage of NPN type triode V777 drops to 0.7V when following, triode V777 ends, DC power supply 5VM acts on the Enable Pin ENA of inverter controller N701 by resistance R 780 and diode V778, make the voltage that is applied to Enable Pin ENA greater than threshold voltage, thereby start the internal circuit operation of inverter controller N701, drive signal output DRV1, DRV2 output pwm signal by inverter controller N701, to drive the normal break-make of follow-up field effect transistor, generate the required working power of backlight lamp tube in the liquid crystal display screen, the operation that powers on of control liquid crystal display screen.
Meanwhile; for the further output of control inverter controller N701; in the described protective circuit that powers on, also designed the control circuit of a control inverter controller N701 electrifying timing sequence; comprise positive-negative-positive triode V781 (i.e. the second positive-negative-positive triode), first potential-divider network, second potential-divider network and second switch circuit, as shown in Figure 2.In the present embodiment, described first, second potential-divider network is that example is set forth with the resistance pressure-dividing network; The second switch circuit adopts a NPN type triode V782 (i.e. the 3rd NPN type triode) to set up and forms.Wherein, the emitter of positive-negative-positive triode V781 connects DC power supply 5VM, and collector electrode connects the power end VDDA of inverter controller N701, and base stage connects the dividing potential drop node of first potential-divider network of being made up of resistance R 786, R787.DC power supply 5VM is by the collector electrode of divider resistance R786, R787 connection NPN type triode V782, and the second potential-divider network ground connection by being made up of resistance R 783～R785.In described second potential-divider network, the dividing potential drop node between resistance R 785, the R784 connects the Enable Pin ENA of inverter controller N701 by diode VD778; Dividing potential drop node between resistance R 784, the R783 connects the base stage of NPN type triode V782, the grounded emitter of NPN type triode V782.
In the process that system powers on, because the Enable Pin ENA of inverter controller N701 is pulled down to ground, so the base potential of NPN type triode V782 is low, and NPN type triode V782 ends.At this moment, positive-negative-positive triode V781 is in cut-off state owing to its emitter voltage equals base voltage, therefore, not power supply of the power end VDDA of inverter controller N701 in the process that system powers on, inverter controller N701 does not move.When DC power supply 5VM after RC charging circuit charging a period of time, NPN type triode V777 ends, the Enable Pin ENA of inverter controller N701 is changed to high level.At this moment, DC power supply 5VM is under the dividing potential drop effect of second potential-divider network, and the base voltage of putting NPN type triode V782 is a high level, control NPN type triode V782 saturation conduction.At this moment, the emitter voltage of positive-negative-positive triode V781 is 5V, base voltage for 5V voltage by after the first potential-divider network dividing potential drop, its dividing potential drop voltages at nodes.By the resistance of configuration divider resistance R786, R787, when can be implemented in NPN type triode V782 conducting, the node voltage between divider resistance R786, the R787 is less than 4.3V.Thus, when the Enable Pin ENA of inverter controller N701 is high level, positive-negative-positive triode V781 is owing to the difference of its emitter voltage and base voltage is in conducting state greater than 0.7V, and DC power supply 5VM passes through the emitter and collector of positive-negative-positive triode V781 to the power end VDDA of inverter controller N701 output+5V dc power supply VDD.So; can guarantee after system powers on; each road voltage is after stablizing after a while; power to inverter controller N701 again; thereby can guarantee from another point of view that inverter controller N701 stops the output of its drive signal output DRV1, DRV2 in system's power up, protection late-class circuit and equipment.
After system's operate as normal, NPN type triode V777 is in cut-off state all the time, and the Enable Pin ENA current potential of inverter controller N701 is not impacted.Inverter controller N701 is by its drive signal output DRV1, DRV2 output PWM drive signal, control follow-up field effect transistor break-make, DC bus-bar voltage is converted into alternating voltage, generate the alternating voltage of the required amplitude of backlight lamp tube again through contravariant transformer conversion, be the liquid crystal display screen power supply, realize the start operation of LCD TV.
Certainly, described first switching circuit and second switch circuit also can adopt other components and parts, integrated chip or the discrete circuit with on-off action except that above-mentioned triode to set up and form, and present embodiment is not limited in above giving an example.
When system's power down; for drive signal output DRV1, DRV2 to inverter controller N701 realize control; also design has a power down protection circuit on the Enable Pin ENA of inverter controller N701; as shown in Figure 2, comprise positive-negative-positive triode V779 (i.e. the first positive-negative-positive triode), diode VD779, storage capacitor C779 and bleed off resistance R 782.Wherein, the base stage of positive-negative-positive triode V779 connects DC power supply 5VM by resistance R 781, and emitter connects the negative electrode of diode VD779 on the one hand, and connects DC power supply 5VM by the anode of described diode VD779; The positive pole that connects storage capacitor C779 on the other hand, and by bleed off resistance R 782 ground connection, the minus earth of described storage capacitor C779.The RC filter circuit that the collector electrode of described positive-negative-positive triode V779 is formed by current-limiting resistance R780, via resistance R 779 and capacitor C 778 is connected the input of negater circuit, and the Enable Pin ENA by described negater circuit connection inverter controller N701.
In the present embodiment, described negater circuit can adopt a NPN type triode V778 (i.e. a NPN type triode) to form, as shown in Figure 2.Wherein, the base stage of NPN type triode V778 is passed through described RC filter circuit is connected positive-negative-positive triode V779 with current-limiting resistance R780 collector electrode, and the collector electrode of NPN type triode V778 connects the Enable Pin ENA of inverter controller N701, grounded emitter.
When system's power down, the very fast disappearance of DC power supply 5VM, because the appearance value of storage capacitor C779 is bigger, therefore, the electric charge bleed off on it gets slow.At this moment, diode VD779 oppositely ends, positive-negative-positive triode V779 is owing to its emitter voltage is in the saturation conduction state greater than its base voltage, act on the base stage of NPN type triode V778 by positive-negative-positive triode V779, current-limiting resistance R780 and RC filter circuit by the electric current of storage capacitor C779 output, finally cause triode V778 conducting, the current potential of Enable Pin ENA is pulled down to ground, thereby close the internal circuit of inverter controller N701, stop the output of its drive signal output DRV1, DRV2.So, can effectively avoid follow-up main power device to lose efficacy, thereby solve the problem that liquid crystal TV set shutdown screen dodges.
If selected inverter controller N701 closes the internal circuit of inverter controller N701 when its Enable Pin ENA receives the high level enable signal, and when Enable Pin ENA current potential is opened its internal circuit when low, then can directly the collector electrode of positive-negative-positive triode V779 be connected to the Enable Pin ENA of inverter controller N701.When system's power down, the Enable Pin ENA of flow of charge inverter controller N701 by storage capacitor C779 output puts Enable Pin ENA current potential for high, thereby closes the internal circuit of inverter controller N701, the output of blocking-up PWM drive signal, straight-through to prevent complementary drive signal output.
Certainly, described negater circuit also can adopt except that NPN type triode V778 other to realize components and parts or integrated reverse chip that incoming level carry out reverse process, present embodiment be not limited in above for example.
By on the Enable Pin ENA of inverter controller N701, connecting above-mentioned protective circuit and the power down protection circuit of powering on; can effectively protect and the drive signal output DRV1 of inverter controller N701, late-class circuit and the equipment that DRV2 is connected, be applied to eliminate in the liquid crystal TV set situation of the shutdown screen sudden strain of a muscle that occurs in the shutdown process.Certainly, the protective circuit that present embodiment proposed goes for only including one tunnel drive signal output or the inverter controller of multi-channel drive signal output more equally, and present embodiment does not specifically limit this.
Should be noted that; above-mentioned explanation is not to be to restriction of the present utility model; the utility model also is not limited in above-mentioned giving an example; variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present utility model also should belong to protection range of the present utility model.
Claims (10)
1, a kind of protective circuit that is used for inverter controller; comprise the DC power supply that a system disappears when powering on back generation, power down; it is characterized in that: described DC power supply is connected with the base stage of the first positive-negative-positive triode and the anode of a diode respectively; the negative electrode of described diode connects the emitter of the first positive-negative-positive triode on the one hand; connect a storage capacitor on the other hand, the collector electrode of the described first positive-negative-positive triode directly connects or connects by negater circuit the Enable Pin of inverter controller.
2, the protective circuit that is used for inverter controller according to claim 1; it is characterized in that: in described negater circuit, include a NPN type triode; the base stage of a described NPN type triode connects the collector electrode of the first positive-negative-positive triode; the collector electrode of the one NPN type triode connects the Enable Pin of inverter controller, grounded emitter.
3, the protective circuit that is used for inverter controller according to claim 1 is characterized in that: the positive pole of described storage capacitor is by the bleed off grounding through resistance.
4, the protective circuit that is used for inverter controller according to claim 1 is characterized in that: the collector electrode of the described first positive-negative-positive triode perhaps connects the input of negater circuit by the Enable Pin of filter circuit connection inverter controller by filter circuit.
5, according to each described protective circuit that is used for inverter controller in the claim 1 to 4; it is characterized in that: also be connected with the protective circuit that powers in the Enable Pin of described inverter controller; comprise the RC charging circuit and first switching circuit; described RC charging circuit is connected between the control end of the described DC power supply and first switching circuit, and the switch ways of described first switching circuit is connected between the Enable Pin and ground of inverter controller.
6, the protective circuit that is used for inverter controller according to claim 5; it is characterized in that: the control end of described first switching circuit is connected the connected node place of electric capacity and resistance in the RC charging circuit; perhaps connect electric capacity, and then connect described DC power supply by described electric capacity by the resistance in the RC charging circuit.
7, the protective circuit that is used for inverter controller according to claim 5; it is characterized in that: in described first switching circuit, include the 2nd NPN type triode; the base stage of described the 2nd NPN type triode connects the RC charging circuit; and by a grounding through resistance; its collector electrode connects the Enable Pin of inverter controller, grounded emitter.
8, the protective circuit that is used for inverter controller according to claim 5, it is characterized in that: the control circuit that in the described protective circuit that powers on, also includes a control inverter controller electrifying timing sequence, in described sequential control circuit, include the second positive-negative-positive triode, described DC power supply connects the emitter of the second positive-negative-positive triode on the one hand, the switch ways that connects the second switch circuit on the other hand by first potential-divider network, and the switch ways ground connection of passing through described second switch circuit, the dividing potential drop node of described first potential-divider network connects the base stage of the described second positive-negative-positive triode, and the collector electrode of the second positive-negative-positive triode connects the power end of inverter controller; Described DC power supply connects second potential-divider network, and the dividing potential drop node of described second potential-divider network is connected with the control end of described second switch circuit and the Enable Pin of inverter controller respectively.
9, the protective circuit that is used for inverter controller according to claim 8 is characterized in that: the dividing potential drop node of described second potential-divider network connects the anode of switching diode, and connects the Enable Pin of inverter controller by the negative electrode of described switching diode.
10, the protective circuit that is used for inverter controller according to claim 8; it is characterized in that: in described second switch circuit, include the 3rd NPN type triode; the base stage of described the 3rd NPN type triode connects the dividing potential drop node of second potential-divider network; grounded emitter, collector electrode connects described DC power supply by first potential-divider network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200269192U CN201413987Y (en) | 2009-05-31 | 2009-05-31 | Protection circuit for inverter controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200269192U CN201413987Y (en) | 2009-05-31 | 2009-05-31 | Protection circuit for inverter controller |
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| CN201413987Y true CN201413987Y (en) | 2010-02-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105403827A (en) * | 2014-09-12 | 2016-03-16 | 康舒科技股份有限公司 | Power switch abnormity detection device |
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2009
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105403827A (en) * | 2014-09-12 | 2016-03-16 | 康舒科技股份有限公司 | Power switch abnormity detection device |
| CN105403827B (en) * | 2014-09-12 | 2018-03-09 | 康舒科技股份有限公司 | The abnormal detector of power switch |
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Granted publication date: 20100224 Termination date: 20120531 |